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Piet Hut, another Dutch astronomer fifty years younger than Jan Oort, decided to take seriously the possibility that comet showers are periodic. If they are periodic, the theory that they are caused by the random passing-by of alien stars cannot be right. If showers are periodic, they must be explained by a different…
So numerous are the objects which meet our view in the heavens, that we cannot imagine a point of space where some light would not strike the eye;—innumerable stars, thousands of double and multiple systems, clusters in one blaze with their tens of thousands of stars, and the nebulae amazing us by the strangeness of…
What I really, truly miss is the physical trail that typing usually gives you. Typing on an actual typewriter on paper is only a softer version of chiseling words into stone.
The children take turns rolling the dice, which are labeledu00a0zero 1s tou00a0five 1su00a0onu00a0the first die andu00a0zero 10s tou00a0five 10s on the second die. Afteru00a0a studentu00a0rolls theu00a0two dice, he takes theu00a0rodsu00a0and cubes representing the number of 10s and 1s he rolled and puts them on his…
Faith is a fine invention For gentlemen who see; But microscopes are prudent In an emergency.
Twinkle, twinkle little star. I don't wonder what you are, For by spectroscopic ken I know that you are hydrogen.
he best developers I’ve worked with were willing to admit when they didn’t know something. Of course they could learn quickly. If you meet an arrogant developer who pretends to know everything, be careful. To them, their ego is more important than your software. An insecure person who mixes up their self-worth with…
Science’s contributions to the spread of disbelief is the least controversial segment of the virtuous cycle for which I am arguing in seventeenth-century Europe. For science’s methods are clearly troublesome for religion. The devout, to begin with, are not wont to view their precepts merely as propositions to be…
Technology can play an important role, but we haven’t had the time or wherewithal to explore it fully. I’m waiting for a breakthrough process, which I think may happen in mathematics. The people at Nintendo figured out billions of dollars ago that you pull kids in, you get them engaged, and that’s the model…
In summary, the circumstellar shells of Dyson civilizations-at temperatures ~300 degrees K and radii ~1 a.u.--can be detected with existing telescopes and state-of-the-art infrared detectors in the 8-13-u window out to distances of several hundred parsecs. But discrimination of Dyson civilizations from naturally…
As to your reasoning of the inconvenience that a centre would become further removed from another centre than from the circumference of his own globe, though centres are of the same species while the centre and circumference are of contrary nature and should therefore be furthest removed from one another, I reply as…
figure out how to live with high technology, how to avoid nuclear war, then tehre are at this moment a million advanced civilizations in the Milky Way. This place was built to help get us through this dangerous time. it would be good to know if there are other civilizations out there, if their United Nations have…
Might interstellar communication not be messages but music--perhaps a 600 part invention, each part on an adjacent frequency channel? If there were more conventional representation of frequencies for example, the full frequency range corresponding to the range between 1420 and 1667 megahertz would we have the wit to…
Imagine the history of the galaxy with respect to extraterrestrial intelligence. Very early there were only first generation stars, no heavy metals and therefore no possibility of life, much less intelligence. That's Stage One. In Stage Two planets with heavy metals form from the starstuff processed in the previous…
The adult Sagan always sounded like the smartest person in the room, but in the papers we encounter this interesting note in a 1981 file, right after “Cosmos” hit it big: “I think I’m able to explain things because understanding wasn’t entirely easy for me. Some things that the most brilliant students were able to see…
The history of physics is littered with unrealized grand experiments: old blueprints buried in file drawers, half-built machinery packed in crates, excavated earth filled with pooling rainwater—the detritus of Big Science. As the frontier of human knowledge pushes forward, so, too, does the cost and the complexity of…
She followed him over to the wall, where he settled onto a bench. “Syrio Forel was first sword to the Sealord of Braavos, and are you knowing how that came to pass?” “You were the finest swordsman in the city.” “Just so, but why? Other men were stronger, faster, younger, why was Syrio Forel the best? I will tell you…
Behind every man now alive stand thirty ghosts, for that is the ratio by which the dead outnumber the living. Since the dawn of time, roughly a hundred billion human beings have walked the planet Earth. Now this is an interesting number, for by a curious coincidence there are approximately a hundred billion stars in…
A scientific observation is always a committed observation; it confirms or denies one's preconceptions; one's first ideas, one's plan of observation; it shows by demonstration; it structures the phenomena; it transcends what is close at hand; it reconstructs the real after having reconstructed its representation.
However, the subject need not be an esoteric one for a gedankenexperiment to be fruitful. My own favorite is Galileo’s proof that, contrary to Aristotle’s view, objects of different mass fall in a vacuum with the same acceleration. One might think that a real experiment needs to be conducted to test that hypothesis…